Process of purifying and decolorizing rosin



Patented June .16, 1931 umreosTAr-Es PATENT OFFICE nonnnreranunn; or PENSACOLA, 'rnonrnn, AssIGNoa-ro THE unwron'r comrm,

. or caniaoLLvILLE, WISCONSIN, A CORPORATION or DELAWARE This invention relates to a 'processof purifying and decolorizing rosin containing material by the use of resorcinol and adsorptive materials and to the purified rosin obtained thereby. 4 4

It is an object of this invention to provide a method whereby an inferior grade of rosin may be purified in an economical and practical manner to produce as final products 10 purified rosins up to and including the high-- the gum and wood rosins. The present invention embodies certain improvements over the above process, as a result of whichstill higher grades of rosin can be obtained.

It has been found that in the treatment of rosin, in any of the usual rosin solvents, such as petroleum naphtha, gasoline and other aliphatic, hydrocarbons, with resorcinol,

there still remains some color in the rosin extract after limited treatment; whereas if this 7 partially purified rosin be still further treated with an adsorptive material like fullers earth, charcoal or the like, the last traces of color may be com letely removed. After removal. of the 'so vent there'results 'a rosin product. of exceptionally high quality corre- Isgonding' to the standard 0 WW rosin or tter.

I am fully aware that fullers .earth and t the like have been previously proposed as a means of decolorizing rosin. In the use of the'adsorptive materlals alone, however, the removal of the coloring matter is a more tedious and impractical method for'the reason ".45

thatlthe adsorptive material becomes too easily saturated. l

' The rinciple of-;:thi s invention resides in e me 0d for ther'emoval of theimpurities b the combination of the two ste s, namely e removal of the bulk of the impurities OF PURIFYING AND DECOLORIZING ROSIN application am September 19, 1927. Serial No. 220,646.

v Ewample I To a solution of 2000 parts of rosin extract, as is commonly obtained in the production of wood rosin by the extraction of resinous woods with petroleum naphtha, are added 50 parts of resorcinol. The resulting mixture is well agitated and heated to the boiling point of the solvent. Without prolonged treatment, the mixture is then cooled to ordinary or low temperature, say 15 C. There results a solution of partially purified rosin and a precipitated mass containing the bulk of the impurities, from which the rosin solution may be easily decanted. The so-decanted solution contains in addition to the rosin a small amount of dissolved resoroinol, which is then extractedwith water. The rosin extract, from which the resorcinol has been practically completely removed, is then slowly run through a purifying tower partiall filled with 200 parts of fullers earth, whic has previously been dried to remove excess water. The extract after running through Ewample I Method of procedure is the same as in Example #1 except that 300 parts of charcoal are used instead of the fulle'rs earth. The charcoal used .is of the type adapted for the decolorizing of oils.

While in the above examples, a filtration step has been employed, I do not wish to limit my method to any particular manner of treat- 100 ing the rosin extract with the adsorptive material. My preferred method, for economic extraction processes, or a redissolvedrosin to remove the reasons, consists in causing the rosin extract to flow through a layer of the adsorptive material.

Likewise I do not wish to limit my process to the use of any' definite rosin solvent, as it has been found that the usual rosin solvents disclosed above may be employed in a similar manner. It will be understood that either a rosin extract formed as a step in the usual may be treated by my process. Furthermore I am aware that different proportlonsof the rosin corresponding in color to X standard,

and substantially identical with wood rosin obtainable by treatin resorclnol a resin extract with I to remove t e bulk of the impurities, freeing the rosin extract from the resorcinol and filterlng tract through fullers earth.-

In testimony whereof I have hereunto subscribed my name.

adsorbing material may be used and that temperatures differing from the preferred temperatures may be employed to bring about satisfactory results. I therefore do not purpose to limit the patent granted hereon other than as necessitated by the prior art.

I claim as my invention:

1. The process of improving the quality of rosin, which comprises partially purifying the rosin with resorcinol and subsequently treating the partially purified resin with an adsorptive material to remove remaining impurities.

2. The process of improving the quality of rosin, which comprises treating a rosin extract with resorcmol to remove the bulk of the impurities, substantially freeing the rosin extract from the resorcinol and subsequently filtering the fullers earth to remove the remaining 1mpurities. I

3. The process of improving the quality of rosin, which comprises treating a solution of rosin in petroleum naphtha with resorcinol oring matters from the rosin, substantially freeing the resin solution from the resorcinol and subsequently filtering the resulting rosin solution through fullers earth to remove remaining impurities and coloring matters.

4. The process of improving the quality of treating a solution I of rosin in petroleum naphtha with resorcinol rosin, which comprises to remove the bulk of the impurities and coloring matters from the rosin, substantially freeing the rosin solution from the resorcinol, subsequently solution through fullers earth to remove remaining impurities and coloring matters, evaporating the solvent from the solution of the purified rosin and recovering the purified rosin.

5. As new articles of manufacture, wood rosins corresponding in color to WW rosin or better, and substantially identical with.

wood rosin obtainable by treating a rosin extract with rcsorcinol to remove the bulk of the impurities, freeing the rosin extract from the resorcinol, and filtering the resulting rosin extract through fullers earth.

6. As a new article of manufacture, wood resulting rosin extract through bulk of the impurities and col- ROBERT c. PALMER.

the resulting rosin exfiltering the resulting rosinv 

